20761970 has 16 divisors (see below), whose sum is σ = 38660760. Its totient is φ = 8018304.

The previous prime is 20761963. The next prime is 20761973. The reversal of 20761970 is 7916702.

It can be written as a sum of positive squares in 4 ways, for example, as 16152361 + 4609609 = 4019^2 + 2147^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20761973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35507 + ... + 36086.

Almost surely, 2^20761970 is an apocalyptic number.

20761970 is a deficient number, since it is larger than the sum of its proper divisors (17898790).

20761970 is a wasteful number, since it uses less digits than its factorization.

20761970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71629.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 20761970 is about 4556.5304783355. The cubic root of 20761970 is about 274.8460626065.

The spelling of 20761970 in words is "twenty million, seven hundred sixty-one thousand, nine hundred seventy".